Well, it depends on the specific fanfic. Some fanfics might focus on Naruto's growth post - Shippuden and give him abilities that make him stronger than Itachi. For example, they could have Naruto master a new form of Sage Mode that gives him an edge over Itachi's Sharingan - based techniques. However, other fanfics might keep Itachi's power level relatively high and not have Naruto overtake him. So, there's a lot of variation among different fanfics.
Another one is 'Itachi and Shisui: The Untold Tales'. This story weaves in some unique scenarios that might not have been explored in the original series. It shows their interactions with other characters from a different perspective, highlighting their strong bond.
Often, in fanfic, Naruto is made stronger than Itachi because the writers want to explore new story arcs. If Naruto is stronger, new and exciting battles and relationships can be created. For instance, Naruto could be the one to protect Sasuke from Itachi in a different way. Also, Naruto's positive and determined nature makes him a popular character to be super - powered in fanfics.
Another theme is sacrifice. Given their fates in the original Naruto story, fanfictions often play with the idea of how much they were willing to sacrifice for their village, their clan, and for each other. For example, Shisui's sacrifice and how it affected Itachi.
One idea could be a story where Sakura, as a skilled medic, is tasked with treating Itachi and Shisui during a difficult mission. She discovers their complex pasts and bonds with them over time, leading to new alliances and friendships.
Well, you could go for something like 'Itachi and Shisui: A Lemon - Infused Adventure'. This title gives the idea that there's something unique and perhaps a bit zesty about their relationship in the fanfiction. Another option could be 'Lemon - Hued Memories of Itachi and Shisui', which implies that the story might be filled with memories that have a certain flavor, like the sour - sweet taste of a lemon. And also, 'Itachi, Shisui and the Lemon - Scented Plot' could work, suggesting that the plot has an element related to this lemon concept.
Sakura's amusement could actually make Shisui more likely to continue annoying Itachi. Since she finds it funny, Shisui might see it as a sign that his actions are acceptable and entertaining. This could potentially strain the relationship between Shisui and Itachi further if Itachi doesn't like being the target of Shisui's annoyance.
There are quite a few good writers out there. One way to find them is to search for fanfiction communities dedicated to Naruto (since these characters are from Naruto). In these communities, people often recommend their favorite writers. Some writers are known for their in - depth characterizations of Itachi, Sakura and Shisui. They make the characters feel real and add new dimensions to their relationships. You might also want to follow some fanfiction blogs on Tumblr that often share and promote great fanfictions about these characters.
One possible fanfiction could be about Sakura joining an Anbu team that has Itachi and Shisui. Maybe Sakura is a new recruit and she has to learn from the two experienced shinobi. Itachi could be the calm and collected leader, while Shisui is the more easy - going one who helps Sakura adjust to the harsh Anbu lifestyle.
One common theme is loyalty. Given their status as Uchiha, loyalty to the clan and to each other is often explored. For example, in many fanfics, they will go to great lengths to protect one another because of their loyalty.